nuttx/endian.h

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#include <stdint.h>
 
static inline uint16_t __bswap_16(uint16_t x)
{
    return (((x & 0xff00) >> 8) | ((x & 0x00ff) << 8));
}
 
static inline uint32_t __bswap_32(uint32_t x)
{
    return (((x & 0xff000000) >> 24) | ((x & 0x00ff0000) >>  8) |
            ((x & 0x0000ff00) <<  8) | ((x & 0x000000ff) << 24));
}
 
static inline uint64_t __bswap_64(uint64_t x)
{
    return (((x & 0xff00000000000000ULL) >> 56) |
            ((x & 0x00ff000000000000ULL) >> 40) |
            ((x & 0x0000ff0000000000ULL) >> 24) |
            ((x & 0x000000ff00000000ULL) >>  8) |
            ((x & 0x00000000ff000000ULL) <<  8) |
            ((x & 0x0000000000ff0000ULL) << 24) |
            ((x & 0x000000000000ff00ULL) << 40) |
            ((x & 0x00000000000000ffULL) << 56));
}
 
#ifdef CONFIG_ENDIAN_BIG
    #define htobe16(x) (x)
    #define htole16(x) __bswap_16 (x)
    #define be16toh(x) (x)
    #define le16toh(x) __bswap_16 (x)
 
    #define htobe32(x) (x)
    #define htole32(x) __bswap_32 (x)
    #define be32toh(x) (x)
    #define le32toh(x) __bswap_32 (x)
 
    #define htobe64(x) (x)
    #define htole64(x) __bswap_64 (x)
    #define be64toh(x) (x)
    #define le64toh(x) __bswap_64 (x)
#else
    #define htobe16(x) __bswap_16 (x)
    #define htole16(x) (x)
    #define be16toh(x) __bswap_16 (x)
    #define le16toh(x) (x)
 
    #define htobe32(x) __bswap_32 (x)
    #define htole32(x) (x)
    #define be32toh(x) __bswap_32 (x)
    #define le32toh(x) (x)
 
    #define htobe64(x) __bswap_64 (x)
    #define htole64(x) (x)
    #define be64toh(x) __bswap_64 (x)
    #define le64toh(x) (x)
#endif